Diesel fuel is a liquid fuel that can be used in diesel engines. It means it is a fuel whose fuel ignition takes place without any spark because of the compression of the inlet air mixture and the injection of fuel. Diesel engines have found to be of broad use as an outcome of higher thermodynamic efficiency and, thus, fuel efficiency. This is specifically seen where diesel engines are run at part-load as their air supply is not throttled as in a petrol engine and their efficiency still remains very high.
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